Freeport McMoRan engineers estimated that the capital investment necessary for recovering valuable metals (nickel, silver, gold, etc.) from a copper refinery’s wastewater would be $150 million. The equipment is expected to have a useful life of 10 years with no salvage value. The amount of metal currently discharged in the wastewater is 12,500 pounds per year. The recovered metals are expected to have a selling price of $250 per pound. The efficiency relation of the recovery operation is represented by X^0.5, where X represents the efficiency in percentage. What value of X is necessary for the company to break even? Assume i = 10% per year.